Spun dyed yarn



Un ted S es ,Patent'O ice SPUN DYED YARN j Theodore E. Patton, Erika, N.C., assignor to American 21m Corporation, Enka, N.C., a corporation of Delare Q, I Application May 19, 1954, Serial No. 430,813.

g 2 Claims. (Cl. 106'165) I Thisinvention relates to a method for adding an adustable amount of a liquid to a viscous spinning solution and is an improvement in the invention described in Serial Number 417,196, filed March 18, 1954, now abancloned in favor of continuation application Serial No. 655,004, filed August 25, 1957.

In said application Serial No. 655,004 there is described a system for adding materials such as dyestuli to a spinning solution. According to that application, the spinning solution being delivered to the spinnerets is divided into two streams and, in one of the streams, a suction zone is created by arranging two pumps in tandem, the second drawing more than the first delivers. The desired additive is introduced into this suction zone through an ordinary T-connection.

While the above arrangement is entirely satisfactory for some additives and for some spinning solutions, it has been found that the homogeneity of dye distribution in viscose is not reliably maintained.

It is therefore an object of the present invention to overcome this difiiculty and to provide for an improved admixture of an additive with a spinning solution.

Other objects and advantages of this invention will be apparent upon consideration of the following detailed description of a preferred embodiment thereof in conjunction with the annexed drawings, wherein:

Figure 1 is a schematic layout of an'additive supply system in which the present invention is incorporated; and

Figure 2 is a side view to an enlarged scale partly in section showing an additive introduction arrangement according to the present invention.

In accordance with the present invention, the aboveidentified system of providing a shunt stream of viscose and introducing a predetermined quantity of additive thereto prior to combining with a main stream is improved upon by installing at the point of additive introduction a special T-connection having a noule which insures that all of said dispersion is introduced coaxially or centrally of the shunt stream in a direction toward the high capacity pump. This improved system has been found to result in much more homogeneous mixing without the necessity of additional elaborate equipment.

Referring to the drawing in greater detail, a viscous spinning solution is supplied through a pipeline 1 to a spinning machine 2 through a mixer 12. The pipe 1 has a shunt or by-p'ass 3 through which part of .the spinning solution flows. pumps 4 and S which are interconnected in series by a tube including the cross conduit ofa T-connection '6. A supply pipe 7, serving to supply a dyestuif solution or a pigment suspensionfrom a reservoir 8, discharges into the intersecting conduit of the T-connection 6. A filter 9 is located in the pipe 7 and, associated with the filter, are valves and 11.

During use the pipe 7 is in open connection with the reservoir 8 for the low viscosity additive. The shunt or by-pass pipe 3 and the main viscose pipeline 1 discharge In this shunt there are located two gear into the mixer 12, and, from any suitable mixer may be used. Pump 4 is operatedto deliver less than pump- 5; therefore. dyestufi solutions or pigment suspension flows, from pipe 7 through the con :1 nection 6 into the spinning solution, the. total of. the 'two' solutions meeting the pumping demand; of pump 5.

nated by numeral 18 and it is provided with a collar 19 and sealing gaskets working with an end flange 20.

At the point where the conduit 18 discharges into the conduit 13 a nozzle is formed which carries the dyestufli into the center of the stream in conduit 13. This nozzle bearsreference numeral 21. substantially uniform cross-section throughout its length but the conduit area within the nozzle 21 is less than the conduit area within the tube 1. Nozzle 21 is curved so that its mouth faces pump 5.

As shown in Figure 2, the entire T-connection, except for the collars 14, 15 and 19, is made of glass. Glass is a suitable material because it is resistant to the chemi- ;;solution is brought about.

dispersion to viscose solution the improved results obtained with the present invention are believed to be due to the fact that under the conditionsof viscous flow existing in the pipe 3 the dye dispersion does not intimately mix with the viscose solution until introduced into mixer 12. This arrangement prevents stratification of the dye dispersion in pipe 3 and also facilitates the pumping of the mixture through pump 5. While in the illustrated embodiment the pumps 4 and 5 in the additive line are applied to a by-pass in the main system, the actual proportioning of flow between the lines 1 and 3 may vary considerably even to the point where the line 3 carries more than half of the total spinning solution.

Inasmuch as other alternatives and modifications will become apparent to those skilled in this art, it is intended that the present invention be limited only to the,

:extent set forth in the following claims.

What is claimed is:

1. In an, apparatus for blending a dyevdispersion a viscose spinning solution having higher viscosity than said dispersion including a supply conduit for supplying viscose spinning solution to said blending apparatus, a aelivery conduit for delivering said viscose spinning solution to a spinning machine, a pair of connecting conduits extending from said supply conduit to said delivery con:

duit, one of said connecting conduits supplying viscose spinning solution from said supply conduit directly to said delivery conduit, a gear pump of low capacity and a gear pump of high capacity in the other of said connecting conduits, the gear pump of high capacity being nearer said delivery conduit, and means providing a supply 2,934,448. g at nted Apr; 2 6,

the mixer lithe goes tothe spinning machine 2. The particular mixen; used at 12 forms no part of the present inventionand This conduit is held Ihe nozzle is of v with Q i i be iiIdisbei ioi1g the iinpro 1 nec tion havinga', crossconduitconneting said pumps in nlentecomprising 2 1- T-conspinning meeh ine, the hifionensent eomp fisi ng int focfie ing' all of said dye dispersion from the supply tl nerefor' series within said other connecting conduit and an interfleeting eonduitg said intersectin'g pond-nit terminating in coaxially into the'center of said second stream; whereby homogeneous blending of the dye within the viscose solue nozileglisposed'cefiti'al ly and- Coaidally of me crass? tion will occur.

visose spinning solation having higher viscosity'lh'an' 7 said dispersion includingjthestepsofmaintaining a; supply of: viscose spinning 'solution',-'dividing sajgl supply =into -=99 d" ;?n ohnecting'said intersecting 'conginit to V j u yfi dy persion, '7 i V Y In memod'ror; blen' djng a dye-odis a ,-r,lfi rst nd second str eamsj,' "djrecting'viscoseQspinn ng solu- V etionfrom said first streamftoward aspinning machine,

feeding viscose spinn ing' s olutioniinto said'seoond stream" 1 atla' -first rate and wi thdrawing said solution from: this stieam a t a second, higher, fate, supplying adye dispersion to 'sai d-second stream at'a'pointprior to withdrawalof said second stream-at said higher rate; and combining said I and seqondstreams before int roduetionto said References Cited the file of this patent j '1 NIT STA'ITES PATENTS" 

2. IN A METHOD FOR BLENDING A DYE DISPERSION WITH A VISCOSE SPINNING SOLUTION HAVING HIGHER VISCOSITY THAN SAID DISPERSION INCLUDING THE STEPS OF MAINTAINING A SUPPLY OF VISCOSE SPINNING SOLUTION, DIVIDING SAID SUPPLY INTO FIRST AND SECOND STREAMS, DIRECTING VISCOSE SPINNING SOLUTION FROM SAID FIRST STREAM TOWARD A SPINNING MACHINE, FEEDING VISCOSE SPINNING SOLUTION INTO SAID SECOND STREAM AT A FIRST RATE AND WITHDRAWING SAID SOLUTION FROM THIS STREAM AT A SECOND, HIGHER, RATE, SUPPLYING A DYE DISPERSION TO SAID SECOND STREAM AT A POINT PRIOR TO WITHDRAWAL OF SAID SECOND STREAM AT SAID HIGHER RATE, AND COMBINING SAID FIRST AND SECOND STREAMS BEFORE INTRODUCTION TO SAID SPINNING MACHINE, THE IMPROVEMENT COMPRISING INTRODUCING ALL OF SAID DYE DISPERSION FROM THE SUPPLY THEREFOR COAXIALLY INTO THE CENTER OF SAID SECOND STREAM, WHEREBY HOMOGENEOUS BLENDING OF THE DYE WITHIN THTE VISCOSE SOLUTION WILL OCCUR. 